At other distances, images formed by targets do not join the reticle on the scope’s optical axis and can leave the reticle if your eye is off-axis. 22 rimfires or shotguns, are commonly set for zero parallax at 75 yards. Scopes designed for close-range use, say on. Typically, scopes to be used on centerfire rifles are parallax-free at 150 yards. Engineers can “zero out” parallax – put the image on the reticle’s plane – at any range. Where the target image falls on the scope’s optical axis depends on the target distance.
There’s no error when your eye is centered behind the scope or when the image and reticle are in the same plane. In response, you’ll try to correct your aim by nudging the rifle toward the target that appears to have eluded the reticle. That shift occurs if you move your eye off the scope’s optical axis and when the target image formed in your scope is either in front of or behind the reticle. In simple terms, scope parallax is an optical effect that can cause an apparent shift of the target behind the reticle. This can help you avoid missing that trophy shot. This Kahles K624i scope has a horizontal, turret-top parallax dial (set here at 200 yards). Like vinegar on toast, parallax error is your doing. It’s no bother until you spill it on your toast.
It’s always in the cupboard, but you don’t see it unless you look. But it’s endemic in any magnifying optic with a reticle and used at varying distances. Parallax has been called a defect in optical instruments.
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